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diff --git a/slideshow/source/inc/activitiesqueue.hxx b/slideshow/source/inc/activitiesqueue.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX
+
+#include <deque>
+
+#include "activity.hxx"
+
+#include <canvas/elapsedtime.hxx>
+
+#include <memory>
+
+
+/* Definition of ActivitiesQueue class */
+
+namespace slideshow::internal
+    {
+        /** This class handles the XSprite updates needed for
+            animations, such as moves, scales etc. You can add
+            activity objects to this class, which are called in a
+            round-robin fashion.
+        */
+        class ActivitiesQueue
+        {
+        public:
+            /** Create an ActivitiesQueue.
+
+                @param pPresTimer
+                Pointer to global presentation timer. Used for
+                adjusting and holding global presentation time.
+             */
+            explicit ActivitiesQueue(
+                const std::shared_ptr< ::canvas::tools::ElapsedTime >&  pPresTimer );
+            ~ActivitiesQueue();
+            ActivitiesQueue(const ActivitiesQueue&) = delete;
+            ActivitiesQueue& operator=(const ActivitiesQueue&) = delete;
+
+            /** Add the given activity to the queue.
+             */
+            bool addActivity( const ActivitySharedPtr& pActivity );
+
+            /** Add the given activity prioritized last in the queue.
+             */
+            bool addTailActivity( const ActivitySharedPtr& pActivity );
+
+            /** Process the activities queue.
+
+                This method performs the smallest atomic processing
+                possible on the queue (typically, this means one
+                activity get processed).
+             */
+            void process();
+
+            /** Call all dequeued activities' dequeued() method
+             */
+            void processDequeued();
+
+            /** Query state of the queue
+
+                @return false, if queue is empty, true otherwise
+             */
+            bool isEmpty() const;
+
+            /** Remove all pending activities from the queue.
+             */
+            void clear();
+
+            /** Gets the queue's timer object.
+             */
+            std::shared_ptr< ::canvas::tools::ElapsedTime > const &
+            getTimer() const { return mpTimer; }
+
+        private:
+            std::shared_ptr< ::canvas::tools::ElapsedTime > mpTimer;
+
+            typedef ::std::deque< ActivitySharedPtr > ActivityQueue;
+
+            ActivityQueue           maCurrentActivitiesWaiting;  // currently running
+                                                                 // activities, that still
+                                                                 // await processing for this
+                                                                 // round
+
+            ActivityQueue           maCurrentTailActivitiesWaiting; // activities that will be
+                                                                    // processed last in the queue
+
+            ActivityQueue           maCurrentActivitiesReinsert;    // currently running
+                                                                      // activities, that are
+                                                                      // already processed for
+                                                                      // this round, and wants
+                                                                    // to be reinserted next
+                                                                    // round
+
+            ActivityQueue           maDequeuedActivities; // This list collects all activities which did not request
+                                                          // a reinsertion. After the screen update has been
+                                                          // performed, those are notified via dequeued(). This
+                                                          // facilitates cleanup actions taking place _after_ the
+                                                          // current frame has been displayed.
+        };
+
+}
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */